METALLURGY OF CAST IRON.
;es of chill-moulds at one time, he may, under conditions, adopt either for constant use. In e of very low grades of iron it might be neces-) adopt the larger chill-mould, since in the • one the iron might " go all white." oulding test=bars for determining transverse or strength or the deflection or stretch of an iron, hor has advised a very simple design of a flask 3 which would not require a $4-per-day moulder e the mould. Any intelligent laborer can be in a very little while how to mould and cast ars successfully; and this can be easily done .t two minutes.
irting to mould a single test bar, the round test tern, L, and the fluidity-strip pattern, U, Fig. 5 laid in • the recesses of the mould board, Fig. iich has previously been solidly placed. The sk, H, Fig. 118, is then laid on the mould rammed up and rolled over, and then the ' is put on; clamps, at K, Figs. 117 and 120, been put on to hold the two parts close together le cope is being rammed up. Before lifting >e, the test bar pattern L is pulled out end-The cope is now lifted off; the fluidity-strip , U, is drawn out; the cope is put on and I; and the mould is up-ended ready for casting, in Fig. 117. The iron cup, A, Fig. 117, is used purpose of providing a wide funnel to pour into sp the dirt from passing down with the iron, t cut in the iron end of the flask, as seen at E, [7 and 121., is to prevent the iron, as the mould , from rising high enough to touch the under the cup. vShould the metal in coming up